After Marx deposits the manuscript of Capital by hand in Hamburg - he hangs out for the day with Bismarck's niece on the ferry back to London.

I am on a quest to find the best Marx biography myself. Haven’t found it yet, seems like there isn’t one definitive one out there. Michael Heinrich has apparently written a great one but he’s only done one of three volumes (or the others haven’t been translated into English yet, I don’t remember).